Hi toddjharrison73
It is the official documentation http://www.t3-framework.org/documentation/bs3-layout-system#about-layout
Then it is quite simple important is understanding of layout and blocks
Let's say we want to add to the playstore template a new position and this position should be showed in default layout
1) Open this file /templates/ja-playstore/tpls/default.php and let's say it has this structure
<body>
<?php $this->loadBlock ('header') ?>
<?php $this->loadBlock ('mainnav') ?>
<?php $this->loadBlock ('spotlight-1') ?>
<?php $this->loadBlock ('mainbody') ?>
<?php $this->loadBlock ('spotlight-2') ?>
<?php $this->loadBlock ('navhelper') ?>
<?php $this->loadBlock ('footer') ?>
</body>
so we can add a new block showing your new module , let's say a slideshow module
2) change default layout blocks as follow
<body>
<?php $this->loadBlock ('header') ?>
<?php $this->loadBlock ('mainnav') ?>
<?php $this->loadBlock ('slideshow') ?> <-------added it here
<?php $this->loadBlock ('spotlight-1') ?>
<?php $this->loadBlock ('mainbody') ?>
<?php $this->loadBlock ('spotlight-2') ?>
<?php $this->loadBlock ('navhelper') ?>
<?php $this->loadBlock ('footer') ?>
</body>
Now we will need to add the module code named slideshow.php in this folder /templates/ja-playstore/tpls/blocks/
That's it you have now a slideshow position available in default template layout.
P.S.
The above structure of blocks is not the original playstore template , i taked this example from documentation -
Hope it helps